Question

1. Why do cycle tyres sometimes burst on hot summer days?
2. When two stones are rubbed together, they produce a spark. Why?
3. What is the advantage of providing a constriction in clinical thermometers?
4. Why is it not possible to use mercury thermometer to measure temperatures below -39°C?
5. Define temperature. Name the SI unit for temperature.
6. Why does the level of mercury not fall rapidly in a clinical thermometer?​

Answer 1

ANSWER:⏬

1.ans: During summer , air in the tyre expands and exerts pressure on the walls of the tyre so , sometimes tyre bursts in summer.

2.ans:When two stones are rubbed together, there is friction and we all know about the heating effect of friction, so due to the heat produced due to friction, sparks are produced. However it will require a great deal of rubbing together the two stones, to cause fire.

3.ans:Advantage of constriction in clinical thermometer: Prevents the immediate dropping of mercury thread back to the bulb on the removal of thermometer from the patient.

4.ans:As the freezing point of mercury is -38.8 degrees centigrade, it is not possible to measure temperatures below this value. So, the mercury thermometer is not preferred to measure low temperatures (below -38.8 degrees centigrade).

5.ans:Temperature is a physical quantity that expresses hot and cold. It is the manifestation of thermal energy, present in all matter, which is the source of the occurrence of heat, a flow of energy, when a body is in contact with another that is colder or hotter. Temperature is measured with a thermometer. The SI unit of temperature as per the International System of Units is Kelvin which is represented by the symbol K.

6.ans:In clinical thermometers, there is a small bent at the bottom of the tube containing mercury. ... The kink prevents the mercury level from falling down on its own. Due to this, the temperature does not decrease immediately after removing the thermometer from the mouth.

Answer 2

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1. Why do cycle tyres sometimes burst on hot summer days?

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Higher temperatures that occur during the summer months can put more pressure on the air on the inside of the tyres – causing them to heat up. ... Driving on over-inflated tyres causes tyres to expand more than necessary, and then burst due to the pressure of the heat of summer and hot road surface.

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2. When two stones are rubbed together, they produce a spark. Why?

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When two stones are rubbed together, there is friction and we all know about the heating effect of friction, so due to the heat produced due to friction, sparks are produced. However it will require a great deal of rubbing together the two stones, to cause fire.

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3. What is the advantage of providing a constriction in clinical thermometers?

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Prevents the immediate dropping of mercury thread back to the bulb on the removal of thermometer from the patient.

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4. Why is it not possible to use mercury thermometer to measure temperatures below -39°C?

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As the freezing point of mercury is -38.8 degrees centigrade, it is not possible to measure temperatures below this value. So, the mercury thermometer is not preferred to measure low temperatures (below -38.8 degrees centigrade).

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5. Define temperature. Name the SI unit for temperature.

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The quantity which determines the direction of flow of heat between two bodies kept in contact is called temperature.

• The quantity which determines the direction of flow of heat between two bodies kept in contact is called temperature.kelvin (K)
• The quantity which determines the direction of flow of heat between two bodies kept in contact is called temperature.kelvin (K)The kelvin (K) is the base unit for temperature

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6. Why does the level of mercury not fall rapidly in a clinical thermometer?

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In clinical thermometers, there is a small bent at the bottom of the tube containing mercury. The kink prevents the mercury level from falling down on its own. Due to this, the temperature does not decrease immediately after removing the thermometer from the mouth.

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